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imx51 sd1_cmd no signal

Question asked by Johny Hsu on Dec 9, 2014
Latest reply on Dec 10, 2014 by igorpadykov

Dear Sir,

 

I'd MP product for my customer from 2013/4 to now, it's work find.

But now I'm fix some fail main board.

I find the main board can't boot.

1. Using OTG to check the power status, PC can find a new device "SE Blank ELVIS".

2. No connect OTG, and power on, the debug port no any string shown. (SD boot card is good)

3. Using scope check the SD1_CLK, it has signal shown.

4. Check SD1_CMD, no any signal shown.

Would you help to tell us what's happen ??

How about the boot (power on) steps ?

Where point we need to check it ?

We need your best help to teach us to fix some fail board.

We had check some signal between working & fail board.

Thanks a lot~

 

Johny

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